Hi, I'm Jack Hao.
Senior QA Engineer & AI Reliability
Specialist
Bridging 5+ years of enterprise software testing & financial systems (Citibank, WMS) with modern AI agent evaluation, prompt robustness fuzzing, and end-to-end test automation (Playwright, Pytest, Jest).
AI QA Tooling & Production Projects
Specialized developer tools for AI prompt robustness fuzzing, chaos API testing, and full-stack software.
PTE RS Trainer
PTE Repeat Sentence Shadowing & Audio Memory Retention System
Independently engineered to solve personal PTE prep hurdles: short-term auditory memory decay, long-sentence forgetting, and shadowing stutter. Built from real user pain points into an intuitive tool, organically attracting 80+ active test-takers within 48 hours of launch.
AI Art Gallery
Curated Multimodal Vision AI & Art Intelligence Platform
An immersive virtual gallery powered by multimodal LLM integration. Features serverless Edge Functions invoking vision-language models to analyze brushstroke nuances, authenticate artistic schools, and automatically generate museum-grade bilingual curatorial commentary.
PromptHavoc
AI Agent & Prompt Robustness Fuzzing Studio
Stress-test system prompts against jailbreaks, adversarial prompt injections, system prompt extraction, and JSON format drift. Features automated 0–100 vulnerability scoring and instant generation of automated evaluation test suites.
MockHavoc
AI Edge-Case & API Contract Assertion Studio
Converts any standard API JSON response into chaos-mutated edge-case payloads (type corruption, null injections, boundary overflows, latency injection). Instantly compiles production-grade Playwright, Jest, Pytest, and Zod contract test assertions.
NexusMD AI Healthcare Testing Architecture
Clinical Workflow Reliability & Multimodal RAG Evals
Designing RAG evaluation frameworks and deterministic regression suites for AI clinical workflows. Measuring answer faithfulness, source attribution accuracy, and multimodal LLM response consistency under strict HIPAA standards.
5+ Years of Engineering & QA Impact
Demonstrated track record spanning AI healthcare startups, high-concurrency supply chain systems, and global banking transactions.
QA Engineer
- Lead end-to-end quality assurance and automated testing strategies for AI-powered clinical diagnostic & medical workflow platforms.
- Architect automated RAG evaluation frameworks measuring Faithfulness, Context Precision, and Source Attribution to suppress hallucination and ensure evidence-grounded responses.
- Design prompt robustness fuzzing, hallucination guardrails, and deterministic API contract regression suites to prevent defects in clinical data handling.
Senior Software Tester
- Spearheaded quality engineering and SQL data validation for enterprise Warehouse Management Systems (WMS) processing high-volume inventory transactions.
- Constructed complex SQL reconciliation test scripts to guarantee 100% data integrity across order dispatch, picking wave lists, and inventory double-checks.
- Developed automated functional test suites, reducing regression cycle times by 40% and preventing critical discrepancies in logistics dispatching.
Software Tester / QA Engineer
- Executed automated and manual test suites across Android & iOS SDKs and push notification backend systems handling billions of daily messages.
- Analyzed distributed system logs and message queues to troubleshoot delivery latencies, device connectivity failures, and push notification throughput bottlenecks.
- Collaborated directly with core mobile SDK development teams to verify data analytics tracking, user engagement feeds, and client-side stability.
Quality Analyst
- Authored and executed comprehensive test plans for Citibank APAC core banking transaction platforms under stringent financial regulatory standards.
- Conducted rigorous multi-currency transaction, account settlement, and regulatory compliance testing in collaboration with cross-regional engineering teams.
- Identified critical edge cases in transaction handling, ensuring zero defects reached production in mission-critical financial systems.
Modern Tech Stack & Quality Matrix
From modern AI robustness testing and automated contract validation to cloud infrastructure and enterprise databases.
AI Evals & Prompt Security
LLM Robustness & Red Teaming
Test Automation & SDET
End-to-End & Chaos Testing
Languages & Database
Backend & Verification
Cloud, DevOps & IoT
Infrastructure & Deployment
Education & Industry Certifications
Formal degrees in Internet of Things and Software Engineering, complemented by accredited cloud and cybersecurity certificates.
🎓 Degrees & Academics
Master of Internet of Things
2024 — 2025Specialized in Cloud IoT Architectures, IoT Protocols, Distributed Data Mining, Database Fundamentals, and Scalable Backend Platforms.
Bachelor of Software Engineering
2011 — 2015Comprehensive foundation in Computer Science, Data Structures & Algorithms, Java Software Architecture, Database Systems, and Network Security.
📜 Professional Certifications
Google Cybersecurity Professional Certificate
Google / Coursera • Security Auditing, Network Defense, Python Automation
AWS Academy Cloud Foundations
Amazon Web Services • Cloud Architecture, IAM, Serverless, S3/EC2/VPC
Google IT Support Professional Certificate
Google • Networking, Systems Administration, Operating Systems & Security
Let's Build Reliable Software Together
Currently working full-time at NexusMD and always happy to discuss AI quality engineering, test automation frameworks, SDET challenges, or potential collaboration in Australia & worldwide.